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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0736d66bbae40d1af4bdc2205e9aca64d1fa693fdc9130a2497d3f0dd71d48ce' 
  AND token = 'Q6PWUrDmHFUQr7P6VLtMQO4m0Yr7iLXJkjWSQtuesKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}